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um: simplify set_handler()

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For one thing, we always block the same signals (IRQ ones - IO, WINCH, VTALRM),
so there's no need to pass sa_mask elements in arguments.  For another, the
flags depend only on whether it's an IRQ signal or not (we add SA_RESTART
for them).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Al Viro
2011-08-18 20:04:29 +01:00
committed by Richard Weinberger
parent d5c7e8b4ec
commit e87df986ed
4 changed files with 19 additions and 27 deletions
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22
arch/um/os-Linux/signal.c
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@ -111,8 +111,7 @@ void alarm_handler(int sig, struct sigcontext *sc)
void timer_init(void)
{
set_handler(SIGVTALRM, (__sighandler_t) alarm_handler,
SA_ONSTACK | SA_RESTART, SIGIO, SIGWINCH, -1);
set_handler(SIGVTALRM, (__sighandler_t) alarm_handler);
}
void set_sigstack(void *sig_stack, int size)
@ -174,27 +173,28 @@ static void hard_handler(int sig, siginfo_t *info, void *p)
handle_signal(sig, (struct sigcontext *) &uc->uc_mcontext);
}
void set_handler(int sig, void (*handler)(int), int flags, ...)
void set_handler(int sig, void (*handler)(int))
{
struct sigaction action;
va_list ap;
int flags = SA_SIGINFO | SA_ONSTACK;
sigset_t sig_mask;
int mask;
handlers[sig] = (void (*)(int, struct sigcontext *)) handler;
action.sa_sigaction = hard_handler;
/* block irq ones */
sigemptyset(&action.sa_mask);
va_start(ap, flags);
while ((mask = va_arg(ap, int)) != -1)
sigaddset(&action.sa_mask, mask);
va_end(ap);
sigaddset(&action.sa_mask, SIGVTALRM);
sigaddset(&action.sa_mask, SIGIO);
sigaddset(&action.sa_mask, SIGWINCH);
if (sig == SIGSEGV)
flags |= SA_NODEFER;
action.sa_flags = flags | SA_SIGINFO;
if (sigismember(&action.sa_mask, sig))
flags |= SA_RESTART; /* if it's an irq signal */
action.sa_flags = flags;
action.sa_restorer = NULL;
if (sigaction(sig, &action, NULL) < 0)
panic("sigaction failed - errno = %d\n", errno);